The differences between Roth, MBT and Edgewise brackets In orthodontics, brackets are small pieces of molded metal with extended bits that are attached to the teeth of the patient and used to hold an adjustable wire. Brackets help the dentist straighten the teeth through gradual adjustments. The two most common types of braces for teeth are traditional metal braces and invisible braces. Traditional braces use metal brackets connected to the teeth with wire threaded through the brackets that adjust the teeth. And what is the differences between Roth, MBT and Edgewise on the torque and the angle?